@function strengthen($color, $multiplier: 1, $reversed: $reversed-text) {
  @if $reversed {
    @return lighten($color, 20% * $multiplier);
  } @else {
    @return darken($color, 20% * $multiplier);
  }
}

@function soften($color, $multiplier: 1, $reversed: $reversed-text) {
  @if $reversed {
    @return darken($color, 20% * $multiplier);
  } @else {
    @return lighten($color, 20% * $multiplier);
  }
}